Question

81^2x .27^x =9⁵

Answer 1

ta có :

          81^2x .27^x=9⁵

          (3⁴)^2x.(3³)^x=(3²)⁵

          3^8x.3^3x=3¹⁰

              3^11x=3¹⁰

^->11x=10

^->x=\(\frac{10}{11}\)

Vậy x=\(\frac{10}{11}\)

Answer 2

81^2x .27^x =9⁵

\(\Leftrightarrow\)3^8x . 3^3x=9⁵

\(\Leftrightarrow\)3^11x= 3¹⁰

^{\(\Leftrightarrow\)}11x = 10 

\(\Leftrightarrow\)x= 10/11